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© 2006 Red Star RC
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Thank you for purchasing Red Star RC LaGG-3 sport scale model Kit. This kit has been designed using 3D
computer engineering and interlocking construction design help you to build straight lightweight model. Low
wing loading and built in washout make this model a good flying plane. Please keep in mind that this kit is
intended for intermediate builder and intermediate pilot. If you do not meet these criteria, it is recommended to
seek help from a more experienced builder / pilot.
Good luck!
Mike & George.
Red Star RC, BALTIMORE, MARYLAND, USA
WARRANTY…..Red Star RC guarantees this kit to be free from defects in both material and
workmanship at the date of purchase. This warranty does not cover any component parts damaged by use or
modification. In no case shall Red Star RC’s liability exceed the original cost of the purchased kit. Further, Red
Star RC reserves the right to change or modify this warranty without notice.
In that Red Star RC has no control over the final assembly or material used for final assembly, no liability shall
be assumed nor accepted for any damage resulting from the use by the user of the final user-assembled product.
By the act of using the user–assembled product, the user accepts all resulting liability.
If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is advised to
return this kit immediately in new and unused condition to the place of purchase.
Our deep appreciation to Bennie Broughton aka Oryx on www.rcscalebuilder.com for his time and
efforts he spent for deep aerodynamic analysis and recommendations for wing airfoil.
NOTES BEFORE BEGINNING CONSTRUCTION
• Read the instructions and the plan sheet prior to start any work.
• Do not remove the parts from sheets until required.
• Prior to gluing, test fit and match parts over the plan.
Kit Contents:
• Computer Drawn Plan Sheets 2
• Illustrated Instruction Manual 1
• Laser Cut Balsa and Plywood Parts Sheet 30
• Clear Canopy 1
• Fiberglass cowl 1
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Additional Hardware (Required for completing kit):
6-32 Bolt-nut Set (4 bolts, 4 Flat Washers, 4 Lock Washers, 4 Blind Nuts) 1
Push rod (Du-Bro #230) Ailerons 1
E/Z Links (Du-Bro #855) Ailerons 1
E/Z Connectors (Du-Bro #121) 1
Push Rods Sullivan Gold-n-Rod 1
Mechanical Retracts .60 - .90 size 85 degrees 1
Du-Bro Nylon Large Straps 5/32"(4) Landing Gear Covers 1
Wheel Axels 2
Wheel Collars 2
Wheels 4” 2
Robart 121 Scale Retractable Tail wheel 1
Tail Wheel 1.75” 1
Fuel Tank 12 oz 1
Spinner 4.25” (Dave Brown Vortech Standard S242-8242 & XX-long adapter nut) 1
Engine OS-.91FX 1
Muffler 1
Prop Master Airscrew 14x6 1
Robart 3/16" Super Point Hinges 23
Recommended Finishing Items:
MonoKote (Sky Blue 20206) 2
MonoKote (Gray/Green 20211/20214) 2
LustreKote Spray Paint 2
LustreKote Spray Flat Clear 2
Radio Gear:
7-channels receiver (9-channels recommended) 1
6” Servo Extension 2
12” Servo Extension 2
6” Y-servo Extensions 1
Standard Servos 8
Items You May Need:
Thin and Medium CA
30-min Epoxy
Wax Paper or Plastic Wrap
Razor Blades
Different Grid Sand Paper
Balsa Wood Filler
Windex
Isopropyl Alcohol
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Build the Stab & Elevator
Unroll the plan sheets. Put them on your building
board and cover with wax paper so glue will not
adhere.
1. Locate and carefully remove Elevator parts from
balsa sheets. Test fit and sand them if necessary.
Assemble using plan as a reference.
2. Glue precut leading edge ELE.
3. Glue precut tips EET and end blocks EEB.
4. Glue balsa reinforcing edges and sand to shape.
Glue precut hinge blocks EHB.
5. Shape leading edge round.
6. Put stab ribs over the plan and fix them into
position.
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7. Glue central forward ply horizontal reinforcing
stringer, rear reinforcing stringer, subleadning
edges. Glue subtrailing edge and subtrailing edge
doubler. Lightly sand it to prepare for sheeting.
8. Glue hinge blocks according to the plan using
balsa leftovers. Prepare sheeting by gluing three
1/16”x4”x19.5” sheets together along longer side.
Then cut it by half. Sheet top of the stub. Remove
from building board and sheet bottom.
9. Glue precut stub tips HST together.
10. Glue tips to the stub. Glue centering piece HS-
CP in front of the stab.
11. Glue precut leading edges HS-LE to the
stub. Build the Fin & Rudder
1. Glue two rudder halves RF1-1 and RF1-2
together.
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2. Glue two leading edges RLE together. Glue
ribs and resulting leading edge to rudder core.
3. Glue rudder bottom tips RBT together by pairs
and glue them in place in the bottom of the rudder.
3. Glue hinge blocks and control horn support
block from balsa leftovers according to the plan.
Make sure they are lower than ribs.
4. Shape leading edge round.
5. Glue ribs VS1-1(goes up top) and VS1-2
together. Place Vertical stab ribs over the plan. Glue
subleading VSSLE and subtrailing VSSTE edges.
6. Sheet top of the stab. Remove it from building
board.
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7. Glue hinge block and shape it.
8. Sheet Vertical stab from the other side. Glue
together two halves of stab tip VST and glue tip
in place.
Build the fuselage
1. Locate and assemble top fuse formers.
Attention! All formers installed with markings
facing forward (toward nose).
2. Locate and assemble nose parts. Glue
stringers together according to the plan.
3. Assemble fuse nose part over the plan.
4. Glue two 1/8x1/4x24” side bass stringers
together. Make two of them
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5. Put them over the plan and form using t-pins.
Join them with nose part.
6. Glue top formers according to the plan.
Control vertical using square.
7. Install horizontal stab saddle SS. Install top
horizontal substringer FT1. Install stringers.
8. Glue sheeting support doublers SSD. Install
vertical stab.
9. Install canopy rear window former W.
10. Shape top substringer.
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11. Sheet the fuselage with 1/16” balsa sheets. Do
not sheet tail yet. We need an access to the pushrods
installation.
12. Glue precut top stringer FT-2. Now it’s time to
remove fuselage from the building board.
13. Build the motor box. Make sure everything
strait and true. Fuelproof forward part from the
outside using 30 min epoxy tinned with isopropyl
alcohol. It will be hard to access it once installed in
the fuselage.
14. Glue two firewall 1/8” light ply and one 1/16”
burch ply formers. Attach motor mount aligning it
using the reference lines.
15. Install blind nuts and secure them with CA.
16. Glue reinforcing triangles and install firewall
using 30 min. epoxy.
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17. Build retractable tail wheel former from F19-B,
F20 and two TW’s.
18. Glue servo tray doublers F-STD to servo
tray F-ST. Install servo tray into the fuselage.
19. Install motor box and remaining formers in the
fuselage. When installing former F21 you may need
to unglue two side bass stringers from the last
former VSSTE-T. Install Wing Support formers
WS1 and WS2.
20. Install remaining stringers according to the plan.
21. Install wing support plate WSP and bolts
doublers WSP-D underneath the plate.
22. Install two rudder hinge blocks using balsa
leftovers.
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23. Install pushrods according to the plan and glue
them to the formers.
24. Build the fuselage part of air scoop from former
AS4 and stringers ASS-2 and ASS-3.
25. Glue precut sheeting support WSS to wing
saddle doublers and sand them into shape.
.
26. Sheet bottom of the fuselage except tail.
27. Install retractable tail wheel. Connect pull-pull
cable. Sheet tail part of the fuselage.
28. Install pushrod support from both ends from
balsa leftovers.
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29. Install push rod end blocks from both sides.
30. Make elevator joint according to the plan from
3/32” rod.
31. Drill elevator halves according to the plan and
test fit joint. Hinge elevator and horizontal stab.
32. Install pushrod with precut supported former
EPSS.
33. Install horizontal stab. Glue sheeting support
from both sides.
34. Sheet top. Glue precut vertical stab leading
edge. Glue balsa block from balsa leftovers between
vertical stab and top to form fairing later.
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35. Sand fuselage to shape.
36. Glue tail block and sand it to shape. Glue
vertical stab doubler VSTE.
37. Hinge rudder and install precut control horn.
38. Glue small triangle from balsa leftover to
horizontal stab and sand it to shape. Do the same for
another side.
Build the Ailerons
1. Glue two aileron tips together.
2. Glue ribs according to the plans. Glue aileron
tips. Double tip goes to the bottom. Remember that
the other aileron is a mirror copy of this one. Do not
build two identical ailerons!!!
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3. Glue 1/8” end doublers AR-1D and AL-1D.
4. Glue precut leading edge.
5. Glue precut 1/4” balsa hinge blocks (by pairs
from each side). Make sure they are lower than ribs.
Sand them if necessary. Do not round leading edge
yet.
Build the Wing
1. Glue wing rib doublers with 30min epoxy. Pay
attention on left/right position of the doublers!
2. Glue landing gears former doublers with 30min
epoxy.
3. Make landing gear assembly with 30min epoxy.
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4. Cut 1/2”x 1/4” central wing section bass stringers
according to the picture (6.5” and 2.5”). They will
also be a retract servo tray.
5. Glue Top and Bottom wing bolt support blocks
WBB. Top – WBB-1, WBB-2, WBB-3. Bottom –
WBB-1, WBB-2, WBB-3, WBB-4
6. Glue central rib doublers R1-D. Make right and
left of them.
7. Glue flap servo doublers WFSD. They go on
the opposite side than R4-B doubler! Make right
and left ribs!
8. Glue aileron rib doubler. Make right and left
of them!
9. Assemble central wing section according to the
plan.
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10. Assemble subleading edge from WSLE-1 &
WSLE-2
11. Assemble right wing on building board
according to the plan. Glue aileron doubler.
12. Note flap and aileron trailing edge joint.
13. Sand the wing preparing it for sheeting.
14. Install shear web from 3/32 (1/16) leftovers. The
last one goes from the other side in order that not to
interfere with servo tray.
15. Prepare four sheathings from 1/16” balsa sheets
according to the templates provided.
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16. Install top Wing Bolt Support Block WBB
and sand it to shape.
17. Sheet top of the wing. Live a space for flap
sheeting on trailing edge
18. Build and sheet left wing the same way you
built the right one
19. Put flap base on building board. Glue ribs
according to the plan.
20. Glue additional R8 doubler on place according
to the plan (goes from the narrow side!). Remember
to build right and left flaps!
21. Sand the edge of the flap at the rib angle
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22. Sheet flap leading edge and top. Sand to shape.
23. Mount flap servos.
24. Glue balsa 1/4” leftovers to flap and aileron
servo cover bases.
25. Glue them in place.
26. Build wheel well from 1/16” balsa leftovers
and send them to shape.
27. Glue Landing gear shim from ply leftovers,
sheeting support around from balsa and sand to
shape.
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28. Install retract servo, pushrods, retracts and
test them for smooth operation.
29. Install hinge blocks according to the plan.
30. Mark hinge location and then hinge flaps.
31. Glue precut control horn in place.
32. Connect pushrod to test fit flap function.
33. Prepare wing flap top sheeting from precut
1/16” balsa sheet and 1” wide strip sandwich from
1/32” balsa and 1/32” ply according to the templates
provided.
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34. Sheet top of the wing flap area with ply
reinforcing strip facing inside out.
35. Glue bottom wing bolt support blocks and
sand them to shape.
36. Make four servo mounting blocks. Glue support
blocks to servo covers and mount servos.
37. Sand the wing and sheet wing bottom. Cut
servo openings.
38. Cut landing gear openings.
39. Cut central section of trailing edge according to
the plan. Install central section trailing edge
sheeting support blocks from 1/4” and 1/8” balsa
leftovers, shape them and sheet the central section.
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